RU1792778C - Method of making prop of framework - Google Patents

Description

laziness by using pipe material to form the supporting parts.

This goal is achieved by the fact that according to the known method of manufacturing a carcass strut, in which at the ends of a pipe of rectangular cross-section, curved support parts diverging in opposite directions are made, according to the invention, longitudinal grooves are made at the ends of the pipe, dividing each pipe end into two P -shaped profile, sections of the walls of the pipe with grooves are pressed with uniformly distributed forces perpendicular to the bending plane, then applied to the ends of the pipe simultaneously from two sides in the axial direction ki and bent L-shaped profiles in opposite directions.

In FIG. 1 shows a pipe of rectangular cross section with longitudinal grooves; in FIG. 2 - milling grooves; in FIG. 3 is a section AA in FIG. 2; in FIG. 4 - diagram of the fixation and clamping of the workpiece; in FIG. 5 - bending the ends of the pipe (the initial stage); in FIG. 6 - bending (final stage) and calibration of profiles; in FIG. 7 - pipe with supporting parts.

According to the proposed method, a rack frame of a bus window frame is made. Initial blank 1 (Fig. 1) is a welded pipe of rectangular cross-section with dimensions of 40 x 28 x 2 mm and a length of 758 mm. Material - steel 08KP. At both ends of the pipe, longitudinal grooves 2 are made with a length of 130 mm, a width of A mm, which divide the ends of the pipes into four profiles of a 3-6 U-shaped cross section. To make longitudinal grooves, the pipe 1 is laid between the stops 7 and 8 of the base 9 (Fig. 2) and is pressed by the clamp 10. Then, with cutters 11 and 12, 4 grooves are milled at both ends of the pipe. Milling cutters 11 and 12 perform rotational and translational movements. After milling the grooves, they return to their original position.

The pipe T with longitudinal grooves is placed on the base 13 (Fig. 4) of the device

bending between the drowning lugs 14 and 15 and pressing the clamp 16, transmitting evenly distributed forces perpendicular to the plane of the bend. After that, simultaneously to both ends of the profiles

3-6 (Fig. 5), bending forces PI and P2 are applied from both sides (Fig. B), starting from the open ends, while the resulting force Pp at each moment of bending is directed perpendicular to the tangent 16 to the curved generatrices 17 of profiles 3 -6. The ends of the profiles 3-6 are bent in opposite directions (Fig. 7). In this case, the resulting force Pp (Fig. 8) is directed perpendicular to the tangent 18. In the final stage, the bending process calibrates the curved surfaces of profiles 3-6 between the curved surfaces of 19-22 punches 17 and 18 and the curved surfaces of 23-26 dies

27 and 28 .;

At the final transition (Fig. 9), the bevels of the supporting parts are cut so that the edges of the shelves, curved to the edge, on each side lie in the same plane,

those. edges 29 and 30 and corresponding edges located beyond the plane of the drawing lie in the same plane; edges 31 and 32 and their corresponding edges located beyond the plane of the drawing also lie in

one plane. .

The finished part has a height of 690 mm, the width of the support parts in the bend plane is 172 mm, the radius of the interface between the support parts and the pipe is 90 mm, the height of the support part is 72

mm

In comparison with the prototype, the proposed method provides a reduction in material consumption by 20% and labor intensity by 20-25%.

Claims (1)

SUMMARY OF THE INVENTION A method of manufacturing a carcass strut in which at the ends of a pipe of rectangular cross-section, support parts are curved, diverging in opposite directions, characterized in that, in order to reduce material consumption and laboriousness of manufacture, by using pipe material to form the support parts, pipe ends longitudinal grooves are made, dividing each end of the pipe into two U-shaped profiles, sections of the walls of the pipe with grooves are pressed with uniformly distributed forces perpendicular to the plane of the gy & a, then bending forces are applied to the pipe ends simultaneously from two sides in the axial direction and bend P-different profiles in opposite directions. View B FIG. 6 FIG. 7